log_mf_h

An Event Handler which Logs Events to Disk

The log_mf_h is a gen_event handler module which
can be installed in any gen_event process. It logs onto disk all events
which are sent to an event manager. Each event is written as a
binary which makes the logging very fast. However, a tool such as the Report Browser (rb) must be used in order to read the files. The events are written to multiple files. When all files have been used, the first one is re-used and overwritten. The directory location, the number of files, and the size of each file are configurable. The directory will include one file called index, and
report files 1, 2, .....

Functions

init(Dir, MaxBytes, MaxFiles)

init(Dir, MaxBytes, MaxFiles, Pred) -> Args

Dir = string()

MaxBytes = integer()

MaxFiles = 0 < integer() < 256

Pred = fun(Event) -> boolean()

Event = term()

Args = args()

Initiates the event handler. This function returns
Args, which should be used in a call to
gen_event:add_handler(EventMgr, log_mf_h, Args).

Dir specifies which directory to use for the log
files. MaxBytes specifies the size of each individual
file. MaxFiles specifies how many files are
used. Pred is a predicate function used to filter the
events. If no predicate function is specified, all events are
logged.